Rainwater Harvesting Calculator & Material Planner
Rain-event yield, first-flush allowance and storage overflow.
Project estimate
Rainwater Harvesting Planner
$1,110–$1,277
Material estimate + optional reserve · USD
- Potential collected water
- 748.05 gal
- Stored after first flush
- 733.05 gal
- Event overflow
- 0 gal
- Working time allowance
- 0.63 days
10 person-hours / 2 people / 8 h per day. Provisional activity rates; adjust in advanced options.
Excludes labor, tax, delivery, equipment rental, permits and site work. Sample prices are not live retailer quotes. Upper budget includes 15% contingency.
Cost breakdown
- Storage
- $850
- Filtration
- $150
- Fittings
- $110
Shopping list
0 / 3 checkedWhole packages rounded up. Edit a unit price to use your supplier's quote.
Storage
Storage tank
1 unit
$850$850 per unit
Filtration
First-flush storage allowance
15 gal
$150$10 per gal
Fittings
Screen / overflow / outlet kit
1 kit
$110$110 per kit
Save this project
Saved on this browser only. No account required.
Assumptions & project notes
- Material allowance: 0%. Package sizes and coverage rates are editable in the inputs.
- Roof area is horizontal catchment. One event cannot determine year-round storage reliability; use local rainfall and demand data.
- Check final dimensions, product specifications and any required local approvals before ordering.
Tools & preparation
- Tape measure and layout stakes
- Level or grade-checking tools
- Spade, rake and wheelbarrow where required
- Product-specific cutting and connection tools
A preparation list; confirm installation tools with your selected products.
How to use the rainwater harvesting planner
Start with area, design rainfall event, capture efficiency, selected storage capacity. The result includes potential collected water, stored after first flush, event overflow. Open advanced options to match your product sizes, material allowance and labor expectations.
1. Measure and specify
Measure the treated area or route and record soil, slope, access and utility constraints.
2. Adjust the estimate
Choose the actual product coverage, layer depths or irrigation performance data.
3. Prepare your order
Check delivery units, overlaps, site storage and waste before placing the order.
4. Plan the work
Schedule preparation, installation and final grading or flow checks; follow the selected product instructions.
Frequently asked questions
What does the rainwater harvesting planner estimate?+
Rain-event yield, first-flush allowance and storage overflow. The shopping list includes storage tank, first-flush storage allowance, screen / overflow / outlet kit.
Which assumptions should I check?+
Roof area is horizontal catchment. One event cannot determine year-round storage reliability; use local rainfall and demand data.
Are the prices current supplier quotes?+
No. Initial unit prices are illustrative USD budgeting inputs. Enter a price beside each material to use your own quote. The total includes materials only; labor, shipping, taxes, permits and rental are excluded.
Can I save or share my project?+
Save stores the inputs and prices on this browser. Share link includes the configuration in the address so another device can reopen it. Download CSV exports the shopping list, and Print / PDF opens your browser’s print dialog.